#2 - Renewable Energy > Technical Discussion: Solar Electric System - Photovoltaic > Re: SMK or MC4
Thanks for your detailed response which was very helpful for my understanding.
I did find some interesting additional information on the internet, - so it must be true... ;-) but I'm an engineer and it sounds sufficiently credible that you might be interested. (Item in "quotes" below.)
In conclusion, I plan to use available #10 marine grade cable professionally fitted with MC4 plugs at each end, cut than in two as per your suggestion and then connect it to the SMK panels via an altE SMK to MC4 Array Adapter Set. Hopefully the standard SMK leads on the panels will be long enough to allow the serial connection between two panels.
"Cross-mating any connector, regardless of the brands involved, is not a UL approved connection. It does not matter that both connectors may have independent UL approvals, as they were tested to their own, specific individual tolerances and specifications.
I have seen numerous connections failing due to cross mating issues. The issue is that the metallurgical chemistry of the contacts are going to be different unless they are from the same manufacturer. Over time, the difference in chemical composition causes oxidation and other issues that can lead to temperature rise and other problems.
Another issue is that, companies don't generally release tolerances for their products. This results in possible gaps in the contacts when cross mating, which leads to arcing, and ultimately connector failure."